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LibWeb: Add Canvas Context2D basic font property support

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Bastiaan van der Plaat 2023-08-07 21:48:49 +02:00 • committed by Andreas Kling
parent b05fe22d39
commit bba14f6014
7 changed files with 181 additions and 27 deletions
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46
Userland/Libraries/LibWeb/HTML/Canvas/CanvasTextDrawingStyles.h
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@ -6,6 +6,10 @@
#pragma once
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/StyleComputer.h>
#include <LibWeb/CSS/StyleValues/FontStyleValue.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/Canvas/CanvasState.h>
namespace Web::HTML {
@ -16,11 +20,47 @@ class CanvasTextDrawingStyles {
public:
~CanvasTextDrawingStyles() = default;
void set_text_align(Bindings::CanvasTextAlign text_align) { my_drawing_state().text_align = text_align; }
Bindings::CanvasTextAlign text_align() const { return my_drawing_state().text_align; }
DeprecatedString font() const
{
// When font style value is empty return default string
if (!my_drawing_state().font_style_value) {
return "10px sans-serif";
}
// On getting, the font attribute must return the serialized form of the current font of the context (with no 'line-height' component).
auto const& font_style_value = my_drawing_state().font_style_value->as_font();
return DeprecatedString::formatted("{} {} {} {}",
font_style_value.font_style()->to_string().release_value_but_fixme_should_propagate_errors(),
font_style_value.font_weight()->to_string().release_value_but_fixme_should_propagate_errors(),
font_style_value.font_size()->to_string().release_value_but_fixme_should_propagate_errors(),
font_style_value.font_families()->to_string().release_value_but_fixme_should_propagate_errors());
}
void set_font(DeprecatedString const& font)
{
// The font IDL attribute, on setting, must be parsed as a CSS <'font'> value (but without supporting property-independent style sheet syntax like 'inherit'),
// and the resulting font must be assigned to the context, with the 'line-height' component forced to 'normal', with the 'font-size' component converted to CSS pixels,
// and with system fonts being computed to explicit values.
auto parsing_context = CSS::Parser::ParsingContext { reinterpret_cast<IncludingClass&>(*this).realm() };
auto font_style_value_result = parse_css_value(parsing_context, font, CSS::PropertyID::Font);
// If the new value is syntactically incorrect (including using property-independent style sheet syntax like 'inherit' or 'initial'), then it must be ignored, without assigning a new font value.
if (font_style_value_result.is_error()) {
return;
}
my_drawing_state().font_style_value = font_style_value_result.value();
// Load font with font style value properties
auto const& font_style_value = my_drawing_state().font_style_value->as_font();
auto& canvas_element = reinterpret_cast<IncludingClass&>(*this).canvas_element();
my_drawing_state().current_font = canvas_element.document().style_computer().compute_font_for_style_values(&canvas_element, {}, font_style_value.font_families(), font_style_value.font_size(), font_style_value.font_style(), font_style_value.font_weight(), font_style_value.font_stretch());
}
Bindings::CanvasTextAlign text_align() const { return my_drawing_state().text_align; }
void set_text_align(Bindings::CanvasTextAlign text_align) { my_drawing_state().text_align = text_align; }
void set_text_baseline(Bindings::CanvasTextBaseline text_baseline) { my_drawing_state().text_baseline = text_baseline; }
Bindings::CanvasTextBaseline text_baseline() const { return my_drawing_state().text_baseline; }
void set_text_baseline(Bindings::CanvasTextBaseline text_baseline) { my_drawing_state().text_baseline = text_baseline; }
protected:
CanvasTextDrawingStyles() = default;